"Madam, madam, this incident does not reflect upon you!" he cried impressively, "no one would take upon himself to accuse you of being an instigator or even an accomplice in it, especially as you have proved her guilt by turning out her pockets, showing that you had no previous idea of it.

There are no more uses of "accomplice" in the book.

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Does that make him an accomplice to murder?

Neal Shusterman -- Unwind

One: Go is your accomplice, she was helping you hide this stuff on her property, and in all likelihood, she knows you killed Amy.